upran puran urpan rupan pruan rpuan uparn puarn uaprn auprn paurn apurn urapn ruapn uarpn aurpn raupn arupn praun rpaun parun aprun rapun arpun uprna purna urpna rupna pruna rpuna upnra punra unpra nupra pnura npura urnpa runpa unrpa nurpa rnupa nrupa prnua rpnua pnrua nprua rnpua nrpua upanr puanr uapnr aupnr paunr apunr upnar punar unpar nupar pnuar npuar uanpr aunpr unapr nuapr anupr naupr panur apnur pnaur npaur anpur napur uranp ruanp uarnp aurnp raunp arunp urnap runap unrap nurap rnuap nruap uanrp aunrp unarp nuarp anurp naurp ranup arnup rnaup nraup anrup narup pranu rpanu parnu aprnu rapnu arpnu prnau rpnau pnrau nprau rnpau nrpau panru apnru pnaru nparu anpru napru ranpu arnpu rnapu nrapu anrpu narpu
Note: these 'words' (valid or invalid) are all the permutations of the word upran. These words are obtained by scrambling the letters in upran.